MTUS1 and head and neck squamous cell carcinoma: MTUS1 is downregulated in several types of cancers, including colorectal carcinoma [9,10], lung adenocarcinoma [11], gallbladder adenocarcinoma [12], renal cell carcinoma [13], bladder carcinoma [14,15], adenoid cystic carcinoma of salivary gland [16], squamous cell carcinoma of the tongue [17], head and neck squamous cell carcinoma [18], uveal melanoma [19], and breast carcinoma [20,21].